Assuming they are, I'd check out pricelabs for estimated revenue to decide if it's worth it or not. 

Estimated profit if I sell: 90-100kMy goal:  Buy an investment property and a primary property with a finished basement to house hack.   

Estimated Insurance 2.

I recommend doing a facetime walkthrough with your agent if you can't be there in person so you can see the condition of the property and if you're new to investing and especially to estimating repairs, be sure to get an inspection during your due diligence period.

Look at the current rentals in a market you like to see if they are getting the returns you hope for (this can vary based on management, etc, but can give you an estimate) and this should begin to help you zero in on where/what to buy and how much money you'll need.  

The point is if you have $150K you have enough accumulated to invest in San Diego. 

Covid has skewed everything, some estimates I was and still am getting are absolutely absurd. ($80K to upgrade panel and rewire a $2200 sq ft house- NO!)

I've talked with architects and contractors and have gotten either a lot of friction or >100k estimates to add a bathroom/kitchenette to a detached garage. 

If so, around how much (an estimate) is a typical startup cost to complete a full downstairs of a home for airbnb while istay upstairs to myself?

The $2k is definitely a conservative estimate for rent.